Patent GB-366065-A (GB)
Title: A process for producing artificial masses similar to albumen
IPC: C08G12/40
Filed: 1930-10-18
Abstract: The reaction of urea, thiourea and the like with thioaldehydes described in the parent Specification, is effected cool or cold, and the liquid product is allowed to mature by standing until a crystalline paste forms.  The crystallization may be facilitated by contact of the solutions with metals, particularly aluminium. The paste when dried forms a water-soluble powder which can be moulded with filling materials under heat and pressure.  Examples describe the reaction of urea formaldehyde and ammonium sulphide, the product forming crystals in about four days.  Filling materials of organic or inorganic character may be added, including sulphur, red phosphorus, and metals.  Sulphur may be used in quantities of 1-5 per cent and red phosphorus (as a colouring agent) 1-2 per cent.  The fillers may be employed in the proportion of one part for 3-4 parts of urea originally used. Polymerizing agents, even strong acids, and also dyes and plastifying agents may be added.  Preferably the powder is moistened so as to contain 8-12 per cent of water before moulding. Instead of urea, its derivatives and analogues may be used such as guanidine and dicyandiamide.  The Specification as open to inspection under Sect. 91 (3) (a) includes examples in which the liquid product does not crystallize; in one of these ammonium sulphide containing dissolved sulphur is employed.  Paper or linen or cotton fabrics may be impregnated with the liquids, dried, and pressed alone or in layers to form laminated sheets.  This subject-matter does not appear in the Specification as accepted.ALSO:The reaction of ures, thiourea and the like with thioaldehydes described in the parent case, is effected cool or cold, and the liquid product is allowed to mature by standing until a crystalline paste forms.  The crystallization may be facilitated by contact of the solutions with metals, particularly aluminium. The paste when dried forms a water soluble powder which can be moulded with filling materials under heat and pressure. Examples describe the reaction of urea formaldehyde and ammonium sulphide, the product forming crystals in about four days.  Filling materials of organic or inorganic character may be added including sulphur, red phosphorus, and metals.  Sulphur may be used in quantities of 1-5 per cent and red phosphorus (as a colouring agent) 1-2 per cent.  The fillers may be employed in the proportion of one part for 3-4 parts of urea originally used. Polymerizing agents, even strong acids, and also dyes and plastifying agents may be added. Preferably the powder is moistened so as to contain 8-12 per cent of water before moulding. Instead of urea, its derivatives and analogues may be used such as guanidine and dicyandiamide.  The Specification as open to inspection under Sect. 91 (3) (a) includes examples in which the liquid product does not crystallize; in one of these ammonium sulphide containing dissolved sulphur is employed.  Paper or linen or cotton fabrics may be impregnated with the liquids, dried and pressed alone or in layers to form laminated sheets.  This subject-matter does not appear in the Specification as accepted.